Therapeutically active benzothiazines



United States Patent 3,401,166 THERAPEUTICALLY ACTIVE BENZOTHIAZINES John Krapcho, Somerset, N.J., assignor to E. R. Squibb & Sons, Inc., New York, N.Y., a corporation of Delaware No Drawing. Filed Aug. 1, 1966, Ser. No. 569,020 4 Claims. (Cl. 260-243) ABSTRACT OF THE DISCLOSURE This disclosure relates to compounds having a formula in accordancewith Formula I below. These new compounds possess therapeutic activity and may be utilized as tranquilizers.

This invention relates to new chemical compounds having valuable therapeutic properties and processes for the preparation thereof.

The therapeutically active compounds of this invention are of the general formula wherein Y is selected from the group consisting of thia (S), sulfone (SO sulfoxide (-SO-) and oxa (-O); R is selected from the group consisting of lower alkyl, lower alkenyl, aralkyl or aralkenyl; R is selected from the group consisting of hydrogen and lower alkyl; X and X may be the same or different and are selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, amino, dialkylamino, halo, lower alkylthio (e.g., CH CH CH S-), hydroxy, cyano, nitro and trifluoromethyl; A represents lower alkylene; B is a basic nitrogen containing radical having less than twelve carbons; p is an integer from one to three and n represents 0 or 1, and to salts thereof.

Among the suitable radicals represented by the symbol B are: amino; (lower alkyl)amino; di(lower alkyl)amino; (hydroxylower alkyl) amino; di(hydroxylower alkyl) amino; phenyl(lower alkyl)amino; N-(lower alkyl)phenyl (lower alkyl)amino; and saturated 5- to 7-membered monocyclic heterocyclic radicals of less than twelve carbon atoms, as exemplified by piperidino; (lower alkyl) piperidino; di(lower alkyl)piperidino; (lower alkoxy)piperidino; homopiperidino; 2,3- or 4-piperidyl;

2,3- or 4-(N-lower alkylpiperidyl); pyrrolidino; (lower alkyl)pyrrolidino; di(lower alkyl)pyrrolidino; (lower alkoxy)pyrrolidino; 2- or S-pyrrolidyl; 2- or 3-(N-lower alkyl pyrrolidyl); morpholino; (lower alkyl)morpholino; di(lower alkyl)morpholino; (lower alkoxy)morpholino; thiamorpholino; (lower alkyl)thiamorpholino; di(lower alkyl)thiamorpholino; (lower alkoxy)thiamorpholino; piperazino; 4-R-substituted piperazino (e.g., N -ethylpiperazino; N -phenylpiperazino, and so forth); [hydroxy (lower alkyl)]piperazino [e.g., N -(2-hydroxyethyl)piperazino]; (lower alkyl)piperazino, e.g., N -methylpiperaz ino); di(lower alkyl)piperazino; (lower alkyl)piperazino; homopiperazino; and 4-R-substituted homopiperazino (e.g., N -benzylhomopiperazino).

The terms lower alkyl, lower alkoxy, and lower alkylene, as employed herein, include both straight and branched chain radicals of less than eight carbon atoms, for example, methyl, ethyl, propyl,-isopropyl, butyl, isobutyl, t-butyl, amyl, methoxy, ethoxy, propoxy, isopropoxyfethylene, propylene, and the like.

The term aryl as emploed herein includes mononuclear and dinuclear radicals such as X-substituted phenyl (including 3,4-methylenedioxyphenyl and 3,4-ethylenedioxyphenyl), furyl, thienyl, naphthyl or piperidyl.

The particularly preferred compounds are those wherein X and X are hydrogen, Y is sulfur or oxygen, R is lower alkyl, R is hydrogen, A is ethylene, B is dimethylamino and both ns are 0.

As to the salts, those coming within the purview of this invention include the acid-addition salts of those compounds containing a basic group particularly the non-toxic acid-addition salts and the quaternary ammonium salts. Acids useful for preparing these acid-addition salts include, inter alia, inorganic acids, such as the hydrohalic acids( e.g., hydrochloric and hydrobromic acid), sulfuric acid, nitric acid, and phosphoric acid, and organic acids such as maleic, tartaric, citric, acetic, salicylic, succinic acid, theophylline, S-chlorotheophylline, maleic, benzoic, nicotinic, methanesulfonic or cyclohexanesulfamic. The quaternary ammonium salts include those formed with alkyl halides (e.g., methyl chloride, isobutyl bromide, dodecyl chloride and cetyl iodide), benzyl halides (e.g., benzyl chloride) and dilower alkyl sulfates (e.g., dimethyl sulfate).

Compounds of this invention and the salts thereof possess central nervous system modifying activity, particularly as depressants and are therefore useful as tranquilizers. They may be administered orally or parenterally in the form of tablets, capsules, elixirs, injectables, or the like, by incorporating the appropriate dosage of the compoound of Formula I or a physiologically acceptable salt thereof in a dosage range similar to that used with chlordiazepoxide. The compounds of this invention also have been found to possess antibacterial activity.

The oxa compounds coming within the .purview of this invention are prepared by reacting a 2-monolower alkylaminophenol having the Formula II wherein R, X and p are as hereinabove defined with an acid halide having the Formula III p III wherein R, X and p are as defined above to yield an intermediate of Formula IV This intermediate is then cyclized as by treatment with an alkali metal hydroxide such as sodium hydroxide to form compound of Formula V (\oqcnrw. (X01 u I l 3 The compound of Formula V is then reacted in an inert solvent, such as toluene, in the presence of a base such as sodamide, potassium butoxide, powdered sodium hydroxide, and the like, with a basic halide of the formula HalA-B wherein Hal is halogen, e.g., chloro or bromo and A and B are as defined above, to yield the new intermediates of this invention having the Formula VI wherein R, R, A, B, X, X, p and n are as defined above. The final products of this invention (compounds of Formula I) are then prepared by reducing the new intermediates of this invention with a reducing agent such as lithium aluminum hydride.

The compounds of this invention (compounds of Formula I) wherein Y is S may be prepared by reducing compounds having the Formula VII S-( HR)n X l i N R o 11R)..

2% VII wherein the symbols are as herein described with a reducing agent such as lithium aluminum hydride.

The corresponding sulfones and sulfoxide derivatives of Formula I may then be prepared by oxidizing compounds of Formula I wherein Y is S with potassium permanganate and hydrogen peroxide, respectively.

Examples of 2-monolo weralkylphenol starting materials are:

o-methylaminophenol; o-t-butylaminophenol; o-heptylaminophenol; 2-ethylamino-4-ethoxyphenol;

3 ,4-dichloro-2-ethylaminophenol;

4-methylthio-2-propylaminophenol;

6-trifluoromethyl-Z-propylaminophenol; 6-trifluoromethyl-2-methyl-aminophenol; 5 -hydroxy-2-methylarnino phenol; 4-dimethylamino-2methylaminophen0l; 3,4-dimethoxy-2-methylaminophenol; 4-cyano-2-methylaminophenol; 6-nitro-2-methylaminophenol.

Examples of compounds which may be utilized as starting materials according to Formula III are.

Examples of starting materials which may be utilized wherein Y is S are:

2-dimethylaminoethyl-4-methyl-2-phenyl-2H-1,4-

benzothiazine-3 (4H) -one;

2- 3 -dimethyla minopropyl) -4-methyl-2-phenyl-2H-1,4- benzothiazine-3 (4H) -one; 2-'( Z-dieth-ylaminoethyl) -4- 2-phenethyl -2-phenyl- 2H-1,4-benzothiazine-3 (4H -one;

2- 2- 4-morpholinyl) ethyl] -4-methyl-2-phenyl-2H-1,4-

benzothiazine-3 (4H) -one;

2- Z-dimethylaminoethyl -2,3-dihydro-5-methyl-2- phenyll ,5 -benzothiazepin-4( 5 H) -one;

2- 2- (4-piperidino ethyl] -2,3 -dihydro-5-rnethyl-2- phenyl- 1 ,5-benzothiazepin-4 5H -one;

3- (3 -dimethylaminopropyl -2,3 -dihydr0-2,5-dimethyl-3- phenyll ,5 -benzothiazepin-4 5 H) -one;

3 [2-(2-pyrrolidyl ethyl] -2,3-dihydro-2,5-dimethyl-3 phenyl- 1 ,5-benzothiazepin-4 5H -one;

Z-dimethylaminoethyl-Z- p-chlorophenyl -4-benzyl-6- chloro-ZH- 1 ,4-benzothiazine-3 (4H -one;

2- Z-diethylaminoethyl -2- (p-methoxyphenyl -4-methyl 6-trifiuoromethyl-2H-1,4-benzothiazine-3 (4H)-one;

2- Z-dimethylaminoethyl -2,3 -dihydro-S-alkyl-Z-phenyl- 8 -bromo-1,5-benzothiazepin-4'(5H)-one;

3 3-dimethylaminopropyl -2,3 -dihydro-5-methyl-3- phenyl-7-trifluoromethyl-1,5-benzothiazepin- 4 5 H) -one.

The following examples are illustrative of the invention. All temperatures are stated in degrees centigrade unless otherwise stated.

Example 1. 2-(2-diethyla minoethyl) 3,4 dihydro-4- methyl-2-phenyl-2H-1,4-benzothiazine, hydrochloride A solution of 11.0 g. 2-(Z-diethylaminoethyl)-4-methyl-2-phenyl-2H 1,4 benzothiazin-3 (4H)-one (RR 200- 205 at 0.4 mm.) in 60 ml. of ether is added dropwise to a suspension of 1.8 g. of lithium aluminum hydride in 100 ml. of ether. This mixture is refluxed for three hours, cooled and treated with 5 ml. of ethyl acetate, 5 ml. of Water and then with a solution of 2 g. of sodium hydroxide in 10 ml. of water. This mixture is stirred for one hour, filtered and the filtrate dried over magnesium sulfate. Evaporation of the dried solvent yields 10 g. of the base. The latter is dissolved in 50 ml. of ethanol, treated with 3.5 ml. of 7.9 N alcoholic hydrogen chloride and diluted with ether to yield a gummy hydrochloride. The latter is triturated with fresh ether several times to give 10 g. of granular material. The latter is dissolved in 60 ml. of chloroform, treated with Darco, filtered and the filtrate poured onto 800 ml. of ether to give 6.8 g. of pale yellow solid.

Example 2.2-(Z-diethylaminoethyl)-3, 4-dihydro-4- methyl-2-phenyl-2H-1, 4-benzoxazine hydrochloride (A) Preparation of 4-rnethyl-2-phenyl-2H-l, 4-benzoxazine 3-(4H)-one. A stirred solution of 51.0 g. of ubromo-a-phenyl-acetyl chloride in 250 ml. of chloroform is cooled to 10 and treated dropwise with a solution of 27.0 g. of o-methylarninophenol and 22g. of triethylamine in 100 m1. of chloroform while maintaining the tempera: ture at 10-20. This mixture is allowed to stand at room temperature overnight and then washed with 100 m1. of water (six times). The organic phase is dried over magnesium sulfate, filtered and the solvent evaporated to give 64 g. of residue. The latter is dissolved in ml. of ethanol and added to a solution of 16 g. of sodium hydroxide in 400 ml. of water at 40. The mixture is then heated at 80-83 for twenty minutes. A heavy oil separates from the mixture. The latter is cooled and the oily phase solidifies. This solid is dissolved in 500 ml. of ether, washed with 50 ml. of water several times and then dried over magnesium sulfate. After evaporation of the solvent, the residual material weighs 31.5 g., M.P.

75-779. Crystallization from 100 ml. of isopropyl alcohol yields 26 g. of material, M.'P. 7678.

(B) Preparation of 2-(Z-diethylaminoethyl)-4-me thyl- 2-phenyl-2H-1, 4-benzoxazine-3 (4H)-one. To a suspen sion of 2.7 g. of 50% sodium hydride in 130 ml. of dimethylformamide is added 13. g. of material from part A.-This mixture is heated to 80, maintained at 80-85 for thirty minutes, cooled and treated with a solution of 11.0 g. of 2-diethylaminoethyl chloride in 40 ml. of toluene. The mixture is stirred at room temperature for one hour and then at 95100 for four hours. The solvent is removed at reduced pressure and the residue is treated with 100 ml. of water and 100 ml. of ether. The ether phase is extracted with dilute hydrochloric acid and the latter solution then treated with sodium hydroxide solution to liberate the base. The free base is extracted with ether, dried over magnesium sulfate, filtered, and the filtrate evaporated. Distillate of the residue gives 6.0 g. of product, B.P. 190-l95 (0.5 mm). The citrate salt of this material melts at l06-l08 (from acetonitrile) (C) Preparation of 2-(2-diethylaminoethyl)-3, 4-dihydro-4-methyl-2-phenyl-2H-1, 4-benzoxazine, hydrochloride. By interaction of an ether solution of the material from part B with a suspension of 1.0 g. of lithium aluminum hydride in ether according to the procedure described in Example 1, the product is obtained.

Example 3.2-[2-(dimethylamino)ethyl1-3, 4-dihydro-4- methyl-Z-phenyl-ZH-l, 4-benzothiazine, hydrochloride Following the procedure of Example 1 but utilizing 2- dimethylaminoethyl-4-methyl-2-phenyl-2H-1, 4-benzothiazine, 3(4H)-one in lieu of 2-(2-diethylaminoethyl)-4- methyl-2-phenyl-2H-1, 4-benzothiazin-3 (4H)-one the desired product is obtained.

Example 4.2- 3- (Dirnethylamino propyl -3, 4-dihydro-4-methy1-2-phenyl-2H-1, 4-benzothiazine, hydrochloride Following the procedure of Example 1 but utilizing 2- (3-dimethylaminopropyl)-4-methyl-2-phenyl-2H-l, 4-benzothiazine-3 (4H)-on e in lieu of 2-(2diethylaminoethyl)- 4-methyl-2-phenyl-2H-l, 4-benzothiaZin-3 (4H)-one the desired product is obtained.

Example 5.-2-[2-(diethylamino)ethy1]-3, 4-dihydro-4- v 4-2=(phenethyl)-2-pheny1-2H-1, 4-benzothiazine, hydrochloride Following the procedure of Example 1 but utilizing 2 -(2-diethylaminoethyl) -4-(2-phenethyl) -2-phenyl-2H-1, 4-benzothiazine-3 (4H)-one in lieu of 2-(2-diethylaminoethyl) -4-methyl-2-phenyl-2H- l, 4-benz0thiazin-3 (4H) -one the desired product is obtained.

Example 6.2-[2-(4-morpholinyl)ethyl]-3, 4dihydro-4- methyl-2-phenyl2H-1, 4-benzothinazine, hydrochloride Following the procedure of Example 1 but utilizing 2- [2-(4-morpholinyl) ethyl] -4-methyl-2-phenyl-2H- l, 4-benzothiazine-3-(4H)-one in lieu of 2-(2-diethylaminoethyl)- 4-methyl2-phenyl-2H-1, 4-benzothiazin-3 (4H)-one the desired product is obtained.

Example 7.-2-(Z-dimethylaminoethyl)-2, 3, 4, S-tetrahydro-S-methyl-Z-phenyl-1, S-benzothiazepine, hydrochloride.

Following the procedure of Example 1 but utilizing 2- (Z-dimethylaminoethyl) -2, 3-dihydro-5-methyl-2-phenyl-1, 5-benzothiazepin-4(5H)-one in lieu of 2-(2-diethylaminoethyl) -4-methyl-2-phenyl-2H- 1 4-benz0thiazin-3 (4H one the desired produc is obtained.

Example 8.-2-[2-(4-piperidino)ethyl]-2, 3, 4, S-teterahydro-5-methyl-2-phenyl-1, S-benzothiazepine, hydrochloride Following the procedure of Example 1 but utilizing 2- [2-(4-piperidino)ethyl] -2, '3-diyhdro-S-methyl-Z-phenyl-1,

6 5-benzothiazepin-4(5H)-one in lieu of 2-(2-diethylaminoethyl) 4 methyl-Z-phenyl-ZH-l, 4-benzothiazin-3 (4H)-one the desired product is obtained.

Example 9.-3-(3-dimethylaminopropyl)-2, 3, 4, S-tetrahydro-2, 5-dimethyl-3-phenyl-l, S-benzothiazepine, hydrochloride Following the procedure of Example 1 but utilizing 3- (3-dimethylaminopropyl)-2, 3-dihydro-2, 5-dimethyl-3- phenyl-1, 5-benzothiazepiu-4(5H)-one in lieu of2-(2-diethylaminoethyl)-4-methyl-2-phenyl-2H-l, 4-benzothiazin- 3(4H)-one the desired product is obtained;

Example 10.3-[2-(2-pyrrolidyl)ethyl]-2, 3,4, 5-tetrahydro'2, S-dimethyl- 3-phenyl-1, S-benzothiazepine, hydrochloride Following the procedure of Example 1 but utilizing 3-[2-(2-pyrrolidyl)ethylJ-Z, 3-dihydro-2, 5-dimethyl-3- phenyl-1, 5-benzothiazepin-4(5H)-one in lieu of 2-(2-die-, thylaminoethyl)-4-methyl-2-phenyl-2H-l, S-benzothiazin- 3(4H)-one the desired product is obtained.

Example 1 1.-2- [Z-dimethylamino) ethyl] -3, 4-dihydro-2- (p-chlorophenyl)-4-benzyl-6-chloro-2H-1, S-benzothiazine, hydrochloride Following the procedure of Example 1 but utilizing 2- dimethylaminoethyl 2 (p-chlorophenyl) 4 benzyl-6- chloro-2H-1, 4-benzothiazine-3 (4H)-one in lieu of 2-(2- diethylaminoethyl)-4-methy1-2-pheny1-2H-1, S-benzothiazin-3 (4H)-one the desired product is obtained.

Example l2.-2-[ (2-diethylamino ethyl] -3,4-dihydro-2- (p-methoxyphenyl) 4-methyl-6-trifiuoromethyl-2H-l, 4-benzothiazine, hydrochloride Example 13 .--2- [2 dimethylamino ethyl] -2,3,4,5-tetrahydro S-alkyl-2-phenyl-8-bromo-1,5-benzothiazepine, hydrochloride Following the procedure of Example 1 but utilizing 2 (Z-dimethylaminoethyl)-2,3-dihydro-5-alkyl-2-phenyl- 8-bromo-1,5-benzothiazepin-4(5H)-one in lieu of 2-(2- diethylaminoethyl) 4 methyl 2-pher1yl-2H-l,5-benz0- thiazin-3 (4H)-0ne the desired product is obtained.

Example 14.3 [(3 dimethylamino)propyl] 2,3,4,5-

tetrahydro 5 methyl-3-phenyl-7-trifluoromethyl-1,5- benzothiazepine, hydrochloride Following the procedure of Example 1 but utilizing 3 (3 dimethylaminopropyl) 2,3-dihydro-5-methyl-3- phenyl 7-trifluor0methyl-1,5-benzothiazepin-4(5H)-one in lieu of 2-(2-diethylaminoethyl)-4-methyl-2-phenyl-2H- 1,5-benzothiazin-3(4H)-one the desired product is obtained Example 15.--3- 2- (pyrrolidyl ethyl] -3 ,4,5,6-tetrahydro- 6 methyl 3-(3-chlorophenyl)-2H-1,6-benzoxazocine, hydrochloride Following the procedure of Example 2 but substituting -bromo-fl-(3-chlorophenyl)butynoyl chloride for 0&- bromo-a-phenylacetyl chloride in part A thereof and 2- pyrrolidylethylchloride for Z-diethylaminoethyl in part B thereof the desired product is obtained.

Example 16.2 [2 (morpholinyl ethyl] -2,3 ,4-trihydro-5- methyl-Z-phenyl-1,5-benzoxazepine, hydrochloride Following the procedure of Example 2 but substituting ,8-bromo-fl-phenylpropionyl chloride for a-bromo-aphenylacetyl chloride in part A thereof and 2-(morpholinyl)ethyl chloride for 2-diethylaminoethyl in part B thereof the desired product is obtained.

7 Example 17.-3 [2(piperidino)ethyl)-2,3,4-trihydro-5- methy1-3-phenyl-1,5-benzoxazepine, hydrochloride Following the procedure of Example 2 but substituting fl-brorno-u-phenylpropionyl chloride for oc-bfOIllO-aphenylacetyl chloride in part A thereof and Z-piperidinoethyl for 2-diethylaminoethyl in part B thereof the desired product is obtained.

Example l8.2-[2-(diethylamino ethyl] -3,4-dihydro-4- methyl-2-phenyl-2H-l,4-benzothiazine-S-dioxide To a solution of potassium permanganate, 2-[2- (diethylamino)ethyl] 3,4 dihydro-4-methyl-2-phenyl- 2H-1,4-benzothiazine is added and the desired product recovered.

Example 19.2- [2- diethylamino ethyl] -3,4-dihydro-4- methyl-Z-phenyl-ZH-1,4-benzothiazine-S-oxide Repeating the procedure of Example 18 but utilizing hydrogen peroxide in lieu of permanganate, the desired product is recovered.

Example 20.2- [2- (diethylamino ethyl] -3,4-dihydro-4- methyl-2-phenyl-2H-1,4-benzothiazine, methochloride A mixture of 10 g. of material from Example 1 in 50 ml. of water is treated with 10 ml. of 10% sodium hydroxide solution and the liberated base extracted with 200 ml. of ether. The organic phase is dried over magnesium sulfate, filtered and concentrated to remove the solvent. The residue is dissolved in 50 m1. of acetonitrile and treated with 20 g. of methyl chloride. After standing at room temperature for a day, the mixture is refluxed for one hour and the solvent removed under reduced pressure to give the product.

The invention may be variously otherwise embodied within the scope of the appended claims.

What is claimed is:

1. A compound of the formula I (an.

wherein Y is selected from the group consisting ofS--, SO;;, and SO; R is selected from the group consisting of lower alkyl, lower alkenyl, (X-substituted phenyl)alkyl, 3,4-methylenedioxyphenylalkyl, 3,4-ethylenedioxyphenylalkyl, furylalkyl, thienylalkyl, naphthylalkyl, pyridylalkyl, (X-substituted phenyl)alkenyl, 3,4-

methylenedioxyphenylalkenyl, 3,4 ethylenedioxyphenylalkenyl, furylalkenyl, thienylalk enyl, naphthylalkenyl, and pyridylalkenyl; X and X are the same or difierent and are selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, amino, dialkylamino, halo, lower alkylthio, hydroxy, cyano, nitro and trifluoromethyl;"-A represents lower alkylene; B is a basic nitrogen containing radical having less than twelve carbons selected from the group consisting of amino- (lower alkyl)amino; di(lower alkyl)amino; (hydroxylower alkyl)amino; di(hydroxylower alkyl)amino; phenyl(lower alkyl)amino; N-(lower alkyl)phenyl (lower alkyl)amino; and saturated 5- to 7- membered monocyclic heterocyclic radicals of less than twelve carbon atoms selected from the group consisting of piperidino; (lower alkyl)piperidino; di(lower alkly)- piperidino; (lower alkoxy)piperidino; homopiperidino; piperidyl; (N-lower alkylpiperidyl); pyrrolidino; (lower alkyl)pyrr0lidino; di(lower alkyl)pyrrolidino; (lower alkoxy)pyrrolidino; pyrrolidyl; (N-lower alkylpyrrolidyl); morpholino; (lower alkyl)morpholino;'di(lower alkyl)morpholino; (lower alkoxy)morpholino; thiamorpholino; (lower alkyl)thiamorpholino; di(lower alkyl)thiamorpholino; (lower alkoxy)thiamorpholino; piperazino; 4-R-substituted piperazino; [hydroxy (lower alkyl)]piperazino; (lower alkyl)piperazino; di(lower alkyl)piperazino; (lower alkoxy)piperazino; homopiperazino; and 4-R-substituted homopiperazino; and p is an integer from one to three; and salts thereof.

2. A compound of claim 1, wherein Y is -S-.

3. A compound of the formula S penyl lower alkyl lower alkylene-N C X )D JEHg lower alkyl References Cited UNITED STATES PATENTS 12/1944 Dickey et a1 260243 3/1964 Lowrie 260243 HENRY R. JILES, Primary Examiner.

J. M. FORD, Assistant Examiner. 

